Electronics Forum | Wed Feb 02 21:32:13 EST 2022 | chuckphd53
The rotation is a fixed parameter..... and of the 9 parts, randomly it will skew the part, could be one or more... I was thinking maybe the solder paste was too dry and during the LIFT after placement it would blow the part sideways.. Yes I am on a
Electronics Forum | Thu Aug 01 11:43:57 EDT 2019 | slthomas
I noticed that your solder mask registration is off some. Does it cover a significant portion of any of the pads for these parts? If so, is it possible that the surface tension of the solder at liquidus is enough to skew the part when the solder i
Electronics Forum | Sat Feb 20 20:24:40 EST 2021 | sync40
Hello Ameen, It is needed a moderate impact bump to generate skew. Even blowing of the fans generally cannot generate serious skew -unless the pads apertures are not suitable for the components size/weight. You can try for yourself. Take a board wi
Electronics Forum | Sat Apr 03 19:56:56 EST 1999 | M Cox
I now have the opportunity to work on the MVII's. And I have some questions Do the PCB's have to have tooling holes for the transport of Boards in and out of the machine? These machines are running like S___t. Lots of parts in the reject bin, and s
Electronics Forum | Wed Aug 07 08:54:55 EDT 2019 | jmedernach
It takes a good deal of sudden movement to skew parts. Who makes the oven?
Electronics Forum | Sun Apr 20 07:20:09 EDT 2003 | tsongshe,Bryan
Thanks. *We use TO252 package,but sometimes the skewed components also happen on TO263 package. *we use TO252 package parts from different suppliers,and when we change the parts from one supplier to the others,few skewed transistors happen again. *
Electronics Forum | Thu Feb 03 22:02:11 EST 2022 | stephendo
Another long shot. Are there any irregularities in the shape of the body or leads of the parts that are skewed? Any flash from the molding process for example? Almost all SOT-23s that I have seen are basically perfect but I seem to remember seeing so
Electronics Forum | Thu Mar 08 15:21:43 EST 2007 | pima
To be honest this product its only a part of bigger PCB, so we have only substrate with 3 FETs on it so no other components at substrate occurs and all substrate are staying at metal fixture. WE have already window pan aperture. WE producing this pro
Electronics Forum | Thu Jun 22 11:42:29 EDT 2000 | Chrys Shea
Sal, Silly question: Were the parts skewed before they went into the oven? I've chased down a few similar reflow problems in my lifetime, only to find out it was a pick and place problem. Wrong nozzle size, bad nozzle, feeder not advancing all
Electronics Forum | Wed Apr 25 07:57:36 EDT 2001 | wbu
Steve: Try to find something that�s common to all your skewed parts. We haven�t had much trouble with it except for some MELF diodes a couple of years ago which didn�t look well aligned but made no trouble with specs. Better suited pad design solved
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